CourseWorkElectronicsShop/ElectronicsShop/ElectronicsShopDataBaseImplement/Implements/UserStorage.cs

using ElectronicsShopContracts.BindingModels;
using ElectronicsShopContracts.SearchModels;
using ElectronicsShopContracts.StorageContracts;
using ElectronicsShopContracts.ViewModels;
using ElectronicsShopDataBaseImplement.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ElectronicsShopDataBaseImplement.Implements
{
    public class UserStorage : IUserStorage
    {
        public UserViewModel? Delete(UserBindingModel model)
        {
            using var context = new Database();
            var element = context.Users.FirstOrDefault(rec => rec.ID == model.ID);
            if (element != null)
            {
                context.Users.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }

        public UserViewModel? GetElement(UserSearchModel model)
        {
            if (string.IsNullOrEmpty(model.Login) && !model.ID.HasValue)
            {
                return null;
            }
            using var context = new Database();
            return context.Users.FirstOrDefault(x =>
            (!string.IsNullOrEmpty(model.Login) && x.Login == model.Login  ||
            (model.ID.HasValue && x.ID == model.ID)))?.GetViewModel;
        }

        public List<UserViewModel> GetFilteredList(UserSearchModel model)
        {
            if (string.IsNullOrEmpty(model.Login))
            {
                return new();
            }
            using var context = new Database();
            return context.Users.Where(x => x.Login.Contains(model.Login)).Select(x => x.GetViewModel).ToList();
        }

        public List<UserViewModel> GetFullList()
        {
            using var context = new Database();
            return context.Users.Select(x => x.GetViewModel).ToList();
        }

        public UserViewModel? Insert(UserBindingModel model)
        {
            var newComponent = User.Create(model);
            if (newComponent == null)
            {
                return null;
            }
            using var context = new Database();
            context.Users.Add(newComponent);
            context.SaveChanges();
            return newComponent.GetViewModel;
        }

        public UserViewModel? Update(UserBindingModel model)
        {
            using var context = new Database();
            var component = context.Users.FirstOrDefault(x => x.ID == model.ID);
            if (component == null)
            {
                return null;
            }
            component.Update(model);
            context.SaveChanges();
            return component.GetViewModel;
        }
    }
}